Deterioration Evolutive Process of Cement-Based Materials under Sulphate Physical Crystallization Attack

Kun Lin Ma; Xing Feng; Guang Cheng Long; You Jun Xie

doi:10.4028/www.scientific.net/AMR.168-170.36

Paper Titles

Effect of Blast Furnace Slag and Steel Slag on Cement Strength, Pore Structure and Autoclave Expansion
p.17

Analysis for the Shake Table Test of Rammed Earth Wall Panels
p.21

Cement Hydration Kinetics Research Based on the Multi-Phase Hydration Model
p.26

Cement Chemical Shrinkage Prediction Model Research Based on the Mineral Composition Content of Each Phase at Early Age
p.31

Deterioration Evolutive Process of Cement-Based Materials under Sulphate Physical Crystallization Attack
p.36

Suppressing Expansion Due to Alkali-Aggregate Reaction by Using Limestone Powder
p.40

The Effect of Salt Admixtures on Foam Stability of Different AEAs
p.44

Constitutive Relation of Sulfate Attacked Concrete Based on Uniaxial Loading
p.50

Non-Linear Elastic Incremental Constitutive Model for Confined Concrete
p.57

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Deterioration Evolutive Process of Cement-Based Materials under Sulphate Physical Crystallization Attack

Abstract:

The influencing factors of sodium sulfate solution physical crystallization attack on cement mortars were investigated through analyzing the changes of macroscopical capability and microstructure of cement mortars in attack process. Results indicate that with partial soaking time increasing, more and more sulfate sodium crystals grow on cement mortars surface, and cement mortars surface is denuded gradually. Compressive and flexural strength increase first and then decrease in the deterioration process. In the attack process, porosity of cement mortars decreases first and then increases. Lots of sodium sulfate crystals accumulate in pores of cement mortars and crystallization pressure is on the rise, resulting in physical crystallization attack taking place.